{"cve":"CVE-2009-5010","nvd":{"published":"2010-10-19T20:00:02.957","modified":"2026-06-16T23:14:49.287","status":"Modified","description":"Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.1 allows remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected return value of None, a different vulnerability than CVE-2010-3494.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-362"],"references":["http://bugs.python.org/issue6706","http://code.google.com/p/pyftpdlib/issues/detail?id=91","http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY","http://code.google.com/p/pyftpdlib/source/detail?r=439","http://code.google.com/p/pyftpdlib/source/diff?spec=svn439&r=439&format=side&path=/trunk/pyftpdlib/ftpserver.py"],"products":["g.rodola:pyftpdlib"],"source":"nvd","synced_at":"2026-10-19T19:57:56.749847046+00:00"},"epss":{"cve":"CVE-2009-5010","score":0.01364,"percentile":0.71807,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mpg6-rgp4-35rr","url":"https://osv.dev/vulnerability/GHSA-mpg6-rgp4-35rr","summary":"Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in pyftpdlib","modified":"2024-10-14T18:37:45.677572Z","packages":[{"ecosystem":"PyPI","name":"pyftpdlib","purl":"pkg:pypi/pyftpdlib","ranges":["<0.5.1"],"fixed":["0.5.1"]}]},{"id":"PYSEC-2010-7","url":"https://osv.dev/vulnerability/PYSEC-2010-7","summary":"","modified":"2023-11-08T03:56:54.553892Z","packages":[{"ecosystem":"PyPI","name":"pyftpdlib","purl":"pkg:pypi/pyftpdlib","ranges":["<0.5.1"],"fixed":["0.5.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}